<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="text" class="myInput" >
    <script>
        var myInput = document.querySelector(".myInput");
        function trottle ( fn , delay ){
            var startTime = new Date().getTime();
            return function (){
                var endTime = new Date().getTime();
                if( ( endTime - startTime ) > delay ){
                    fn();
                    startTime = new Date().getTime();
                }
            }
        }
        myInput.oninput = trottle ( function (){
            console.log( myInput.value );
        } , 2000 ) ;
    </script>
</body>
</html>